Pulp beater and selector



uly 29, 3947. H. D. WELLS PULP HEATER AND SELECTOR Filed Dec. 28, 1944 2Sheets-Sheet 1 Jinn ens.

July 29, 1947. H. D. WELLS 6 PUL? Baum ANDYSELECTOR Filed Dec. 28, 19442 Sheets-Sheet 2 I Patented July 2, wil

PULP BEATER E SELEQ'EQR Harold Donald Wells, Glens Falls, N. Y.Application December 28, rats, Serial No. 5%,151

Fig. 2 is an enlarged sectional view through the coacting screen andimpeller and associated parts. I

Fig. 3 is a fragmentary bottom plan view of the impeller shown in Figs.1 and 2.

Fig. 4 is an enlarged detail section on line ii of Fig. 3.

Fig. 5 is a fragmentary-top plan view of the screen shown in Fig. 2.

Fig. 6 is an enlarged detail vertical section on line 6-5 of Fig. 5.

Fig. 7 is a view similar to Fig. 2 but showing a difierent form ofconstruction.

Fig. 8 is a horizontal sectional view on line 88 of Fig. 7.

Preferred features of construction have been illustrated and will berather specifically described, with the understanding, however, thatwithin the scope Of the invention as claimed, variations may be made.

A suitably supported tank i is shown, in which the paper-making materialis immersed in liquid. The bottom H of this tank is curved upwardly atI2 to the side wall Hi to facilitate vertical circulation of the pulp,as indicated by the arrows in Fig. 1.

A central opening It is formed in the tank bottom II, and a, shallowselected-pulp-receivingand-discharge-casing I is secured in saidopening. This casing 95 comprises a continuous side wall l6 fittingwithin the opening Idand having a lateral flange l1 secured by screws orthe like l8 upon the tank bottom I I, a bottom l9 integral with saidside wall l6 and having selected pulp.

outlets I9 connected with suitable pipes 2n, a

- central hub 2i integral with the central portion of said bottom l9,and a screen extending from the upper end of said hub 2| to the upperend of said side wall Hi. In the form of construction 2 form ofconstruction shown in'Figs. 7 and 8, however, the screen is in the formof a suitably per forated plate 25 which may be secured in place by anysuitable means, the screws 26 being shown in Fig. 3 for this purpose.

The boss 22 and the bottom is are jointly formed with a downwardlyopening recess 2? and the upper end of said boss has a central openingshown in Figs.-1 to 6, the screen is in the form of the outer endportions of said grooves. In the i 28 communicating with said recess-2i.This recess receives the upper end of a bearing assembly '29, thehousing 30 of which is secured at it to the lower end of the hub 25, thesecuring being preferably done with the aid of shims 32 which permitvertical adjustment of the entire assembly 29. This assembly rotatablymounts a vertical shaft 33 and holds it against end play. The upperportion of this shaft passes through the open ing 28 with which asuitable packing box 3 1 is associated. A belt drive 35 is shown for theshaft 33 in Fig. l, operatively connecting said shaft with an electricmotor '36, and below said belt drive,

there is preferably another bearing 3? for said shaft.

An impeller is secured upon the upper end of the shaft '33 forimparting. a vertical circulation to the pulp and for performing variousother operations hereinafter described. In Figs. 1 to 4, the impeller isdenoted at 38 and in Figs. 7 and 8, at 38'.

The impeller 38 comprises a central hub 39 and circumferentially spacedarms ib integral arm 40 is preferably longitudinally concave as shown,and this sidepreferably curves transversely from the lower side 43 ofthe arm to the upper edge of the front side 4|, as seen best in p 4.Each arm is formed with a plurality of longitudinal grooves 44 whichopen through its lower side 43 and extend from the hub 39 to the outerend of the arm. This impeller construction is such that the pulp will beeffectively rubbed and brushed against the screen plate 22 and such thatit will impart a vertical motion to the pulp, as well as verticallypulsating the pulp to keep the screen clean. The rubbing and brushing ofthe pulp between the impeller 38 and the screen,

effectively defibers' and. hydrates'said pulp and moreover theindividual fibers will be fibrillated and their ends will be effectivelybroomed. bviously, any relatively large masses of the pulp and largefiakes will be forcibly struck by the arms 40 andwill thusbe broken upto aid in rapid reduction to pulp of the required fineness.

As this fineness is reached, the selected pulp discharges through theslots 2| into the casing I8 and may discharge through the pipes 2|, andob-. viously the apparatus'may either operate continuously or uponbatches.

The impeller 38' shown in Figs. '7 and 8, comprises a hub 39' andoutwardly projecting arms 0' integral therewith and operable over thescreen plate 25. Insofar as their longitudinal shape is concerned, thearmslfl are very similar to the arms 40. They are preferably, however,of rectangular form in transverse section as will be clear from Fig. 7and their lower sides are devoid of grooves. This construction is moresimple than that disclosed in Figs. 1 to 4 and is less rapid inoperation, yet nevertheless constitutes quite an improvement overconventional apparatus for performing the functions above explained. Itwill be obvious that the impeller 38' could be used with any appropriatekind of screen and is not restricted to use with the specific screenplate 25. It will also be understood that the impeller 38 could be usedin connection withvany suitable screen and is not, therefore, restrictedto use with the screen plate 22'. The impeller 38 could well be usedwith the screen '25 and the impeller 38' with the screen 22, if desired.The impeller 38 or 38' may be adjusted further toward the screen byadding one or more of the shims 32, to increase the brushing andscrubbing defibering actions, for better defibering hard sized fibers(stuck together with glue or the like). paper and dry baled pulp, andfrozen-pulp. Also it gives the pulp fibers a brushing, fibrillating andbooming action insuring better and stronger paper. The apparatus doeswork similar to that performed in the conventional paper mill beater,in'which the blades of the beater roll coact with the blades of the bedplate to brush, fibrillate and hydrate the pulp fibers for making intowell formed and strong paper. It improves the usual beating method byfast circulation, thorough mixing, short cycles of pulp travel for anincreased number of beatings, etc., thereby saving time, increasingcapacity and effecting greater efficiency. For effective beating, thepulp canbe worked in batches and when satisfactorily beaten, it canthenbe drawn off through. the screen, thereby preventing chunks from passingalong with beaten pulp, or the machine can be operated continuously forimproved and quicker pulping, resulting from the additional brushing,scrubbing and defibering. 4 While preferences have been disclosed,attention is again invited to the possibility of making variationswithin the scope of the invention as claimed.

I claim: 1. In a pulp beater and selector, a pulp discharge screenforming part of a tank wall, a rotary shaft perpendicular to said.screen and disposed centrally thereof, and an impeller secured to-saidshaft in spaced opposed relation with the inner side of said screen,said impeller having circumferentially spaced arms projecting away fromsaid shaft and spaced from said inner side of said screen in thedirection of the shaft axis, said inner side of said screen beingexposed to thetank interio'r between said arms, said arms each having afront side of a width to beat the pulp and vortically circulate thesame,'said arms being sufllciently close to said screen to cause saidarms and screen to coact in giving the pulp fibers a thorough rubbingand brushing, thereby simultaneously defibering and hydrating the pulp,and fibrillating the individual fibers and brooming their ends.

2. In a pulp beater and selector, a pulp discharge screen forming partof a tank wall, a rotary shaft perpendicular to said screen and disposedcentrally thereof, and an impeller secured to said shaft in spacedopposed relation with the inner side of said screen, said impellerhaving circumferentially spaced arms projecting away from said shaft andspaced from said inner side of said screen in the direction of the shaftaxis, said inner side of said screen being exposed to the tank interiorbetween said arms, said arms each having a front side of a width to beatthe pulp and vortically circulate the same, at least the inner endportions of said front sides being tangential to a circle concentricwith said shaft to vortically circulate the pulp, said arms beingsufllciently close to said screen to cause said arms and screen to coactin giving the pulp fibers a thorough rubbing and brushing, therebysimultaneously defibering and hydrating the pulp, and fibrillating theindividual fibers and brooming their ends. j

3. In a pulp heater and selector, a pulp discharge screen forming partof a tank wall, a rotary shaft perpendicular to said screen and disposedcentrally thereof, and an impeller secured to said shaft in spacedopposed relation with the inner side of said screen, said impellerhaving circumferentially spaced arms projecting away from said shaft andspaced from said inner side of said screen in the direction of the shaftaxis, said inner side of said screen being exposed tothe tank interiorbetween said arms, said arms each having a longitudinally convex frontside of a width to beat the pulp and vortically circulate the same, theinner end portions of said longitudinally convex front sides beingtangential to a circle concentric with said shaft, said arms beingsufficiently close to said screen to cause said arms and screen to coactin giving the pulp fibers a thorough rubbing and brushing, therebysimultaneously defibering and hydrating the pulp, and fibrillating theindividual fibers and brooming their ends.

4. A structure as specified in claim 1; said screen consisting of aplate having substantially radial grooves in the side thereof. towardsaid arms, and pulp discharge slots through said plate between saidgrooves.

5. A structure as specified in claim 1; the sides of said arms towardsaid screen having longitudinal grooves.

6.- A structure as specified in claim 2; the sides of said arms towardsaid screen having longitudinal grooves.

7. A structure as specified in claim 3; the sides of said arms towardsaid screen having longitudinal grooves.

8. In a pulp heater and selector, a screen for coaction with a rotor,said screen comprising a plate having substantially radial grooves inits rotor-facing side, and pulp discharge slots extending through saidplate between said grooves.

9. Apparatus of the character described comprising a tank containingstock to be treated,

-apump-like impeller mounted for rotation in ing a vortical circulation,said impeller having fiber beating, fibrillating and hydrating groovesin the underside of said arms, and a grooved base coactlng with saidgrooved impellerarms, said base having screen openings between'itsgrooves.

HAROLD DONALD WELLS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Name Date Coleman Aug. 18, 1863 Number Number2,033,123 2,289,612 2,351,728 2,371,837 2,156,321 Re. 4,976 2,265,9361,760,446 10 1,790,830

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